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November 14th, 2018, 10:26 AM   #41
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570 pistons / changes in 2009 vs. 2010+

Fwiw I emailed cp who pointed me to thumper racing( must be there design) the volume thumper gave me for it (104) was -9.6
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Last edited by 76model; November 14th, 2018 at 11:00 AM.
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November 14th, 2018, 05:44 PM   #42
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Look at the weight of that 104mm CP. Disgusting. Those weights of 336g and 80g reflect my findings. I used a Wossner pin and reduced weight off the piston to get within 17g total.
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November 14th, 2018, 09:39 PM   #43
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Thanks Alan for confirming weights.ill probably pull the trigger early in the new year,Aussie dollar is supposed to pull a bit back on usd.(unless this group buy gets of the ground of course)

If it jumps right up I'll get the weight down with ti wrist pin ��
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November 14th, 2018, 10:11 PM   #44
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The jbs 104.8 was 328gm and came with am 80gm pin
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November 15th, 2018, 01:36 AM   #45
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Originally Posted by bushmechanic View Post
if the weight is more than about 340gm you will have a hard time selling them imho
hey Bushie, btw, what's the calculation process which results in the 340gm number?

If I were to guess I'd say it were the point of weight after which it gets hard to balance the rotating assembly?
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November 15th, 2018, 03:49 AM   #46
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Originally Posted by 76model View Post
Thanks Alan for confirming weights.ill probably pull the trigger early in the new year,Aussie dollar is supposed to pull a bit back on usd.(unless this group buy gets of the ground of course)

If it jumps right up I'll get the weight down with ti wrist pin ��
Dick, re the TI pin, feedback that i was getting was that the DLC TI didnt have the longevity of the steel pins. That and price helped me decide on the Wossner @$30.50.

Last edited by Alan; November 15th, 2018 at 03:52 AM.
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November 15th, 2018, 05:47 AM   #47
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I specified that cr would be around 13to1,rpm 10000, and that - wanted extra long life out of it. Ti pins wear faster so I will request still but light weight if possible. They should receive my samples soon and then will talk. Yesterday they didn't want to talk about the details.
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November 15th, 2018, 09:22 AM   #48
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Originally Posted by tourist View Post
hey Bushie, btw, what's the calculation process which results in the 340gm number?

If I were to guess I'd say it were the point of weight after which it gets hard to balance the rotating assembly?
yes and its not necessary to have more aluminum than that, just makes everything more difficult
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November 18th, 2018, 05:53 PM   #49
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Originally Posted by thorgan View Post
...And it appears that the 1190 uses a 105mm piston! And it may even use a 20mm wrist pin!
thorgan, it certainly looks as if it uses a 20mm wrist pin, going by the part fiche

Iíll see if I can get hold of one and double check the particulars

Damo
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November 22nd, 2018, 07:14 PM   #50
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I Ride: '07Exc 525 & '07 FS 550.Just sold ' 08 Ktm 450 sxf.
Engineers are now working on it. So I was told. Probably will need more than one week time.
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